[Pw_forum] Use of mixing_beta
Dr. Robert Molt Jr.
r.molt.chemical.physics at gmail.com
Mon Jul 10 19:15:31 CEST 2017
I have 2 questions about mixing_beta.
1.) The manual states that mixing_beta is a mixing factor for
self-consistency. Can someone give a reference to how this is defined,
2.) I have been able to divine from the forums that it is effectively a
scaling of of the previous SCF cycle's density
(http://email@example.com/msg01302.html) as it
relates to the current step's calculation. I appreciate that it improves
Broadly, I am confused why this would be useful to speed up SCF
convergence. I have written my share of SCF codes for molecules with
basis functions of (gaussians+spherical harmonics), but am new to plane
waves and PBCs. In molecular calculations, one never scales the previous
step's density in an iterative solution (or in solving non-linear
coupled cluster amplitudes). Is this somehow akin to DIIS histories, in
some way, to be selective in the previous cycle's estimate?
Thank you for your time,
Dr. Robert Molt
Indiana-University Perdue University
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